Average Speed, Graphing, Distance, Velocity and Acceleration

What does the flat green line represent?

• object is not moving

• Constant Speed

• Acceleration

• Returning back to start

Tags

NGSS.MS-PS3-1

What is the line on this graph showing?

• moving away from starting point at a constant speed

• moving back towards the starting point at a constant speed

• acceleration (getting faster)

• deceleration (getting slower)

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

Average speed = distance / time

• 10 m/s

• 1000 m/s

• 100 seconds

• 10 seconds

Tags

NGSS.MS-PS3-1

On a distance vs. time graph, the steeper the slope _____

• the slower the speed
• the faster the speed
• less acceleration
• greater acceleration

Tags

NGSS.MS-PS3-1

What is the difference between positive and negative acceleration?

• a. Positive acceleration applies to fast objects; negative acceleration applies to slow objects.

• b. Positive acceleration occurs when objects speed up; negative acceleration occurs when objects slow down.

• c. Positive acceleration applies to objects traveling on Earth; negative acceleration applies to objects traveling in space.

• d. Positive acceleration is expressed in meters per second; negative acceleration is expressed in kilometers per hour.

Which of these is an example of acceleration?

• a. A car coasts along at 40 km/hr

• b. A car is parked on the side of the road

• c. A speeding car brakes to stop

• d. A car speeds along at 100 km/hr

Tags

NGSS.MS-PS3-5

Which of these statements is true?

• a. Acceleration in the direction of motion slows you down

• b. Acceleration in the direction of motion speeds you up

• c. Acceleration against the direction has no affect on your speed

• d. Acceleration against the direction of motion speeds you up

Tags

NGSS.HS-PS2-1

You're in a moving car, which of the following changes would always mean there's been some acceleration?

• a. A change in temperature

• b. A change in time

• c. A change in location

• d. A change in speed

The SI unit for acceleration is

• mph
• ft/sec²
• m/s²

A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds. What's the acceleration?

acceleration = change in velocity / change in time

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

Tags

NGSS.HS-PS2-1